UI opt changes

[birdddev]

Very Very WIP

• Remove borders and collapse button for Optionals that aren't groups, so basically everything but groupOpt.
• Moves the checkmark to the right, use the new checkmark styling. Padding between label and checkmarks.
• Optionals will now always show their content, and just dim it instead.
• Fixes rescaleCFG being outside of prefab_model
• Makes the checkboxes (for only the Opts right now) do the drag to activate/deactivate multiple if you start on one checkbox and then hold left mouse and drag on to another.

TODO list/Broken things I've noticed on a quick glance. I will/maintainer can edit this if there's more things I broke.

• [ ] Make inactive Blocks look better. Not sure how I want to approach this yet, but just dimming the elements looks fairly bad.
• [ ] SizeWidget in the latent prefab uses the new padding for non-group Opts when it shouldn't

[rvion]

did what I can to merge your changes into dev; didn't manage to do a merge; everything was conflicting; so I kinda copy pasted bits here and there; hope it's not too bad; tried to commit properly